1

# input must be one of ('ba', 'zp')

Package:
scipy
8546
Exception Class:
ValueError

## Raise code

``````    if kind == 'ba':
ep = atleast_1d(roots(den)) + 0j
tz = atleast_1d(roots(num)) + 0j
elif kind == 'zp':
ep = atleast_1d(den) + 0j
tz = atleast_1d(num) + 0j
else:
raise ValueError("input must be one of {'ba', 'zp'}")

if len(ep) == 0:
ep = atleast_1d(-1000) + 0j

ez = r_['-1',
numpy.compress(ep.imag >= 0, ep, axis=-1),
numpy.compress((abs(tz) < 1e5) & (tz.imag >= 0), tz, axis=-1)]``````
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## Ways to fix

2

`scipy.signal.findfreqs `is used to find array of frequencies for computing the response of an analog filter. The parameter kind specifies whether the numerator and denominator are specified by their polynomial coefficients (‘ba’), or their roots (‘zp’). The valid value are:

```"ba", "zp"
```

## Steps to reproduce the error:

• Install scipy
```\$ pipenv install scipy
```

```\$ pipenv shell
```

• Run the sample code:
```from scipy import signal
signal.findfreqs([1, 0], [1, 8, 25], N=9,kind="b")
```

## Output:

```---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-9-20ea5fdb42c8> in <module>()  1 from scipy import signal ----> 2 signal.findfreqs([1, 0], [1, 8, 25], N=9,kind="b")
/usr/local/lib/python3.7/dist-packages/scipy/signal/filter_design.py in findfreqs(num, den, N, kind)  99 tz = atleast_1d(num) + 0j  100 else: --> 101 raise ValueError("input must be one of {'ba', 'zp'}")  102   103 if len(ep) == 0:
ValueError: input must be one of {'ba', 'zp'}
```

## Fixed version of the code:

```from scipy import signal
signal.findfreqs([1, 0], [1, 8, 25], N=9,kind="ba")
```

```array([1.00000000e-02, 3.16227766e-02, 1.00000000e-01, 3.16227766e-01, 1.00000000e+00, 3.16227766e+00, 1.00000000e+01, 3.16227766e+01, 1.00000000e+02])
```

Sep 23, 2021
kellemnegasi 31.6k